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关于sql where id in 转换成数据类型 int 时失败

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Release: 2016-06-07 17:22:47
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有执行sql条件语句where id in(@参数)的时候,如果处理不当,就会出现问题:

有执行sql条件语句where id in(@参数)的时候,如果处理不当,就会出现问题:
如下面这个存储过程:

alter proc Web_gettwtwgoldgameserverGoldSell
@ID int
as
declare @twgoldsellID nvarchar(1000)
select @twgoldsellID=twgoldsellID from twgoldgameserver where ID=@ID
set @twgoldsellID=replace(@twgoldsellID,'|',',')
set @twgoldsellID=left(@twgoldsellID,len(@twgoldsellID)-1)
select * from twgoldsell where ID in (@twgoldsellID)

我们看上去好像没有什么问题,却在执行的时候报错:

消息 245,级别 16,状态 1,第 1 行
在将 varchar 值 '813,1160,1219,1227,1232' 转换成数据类型 int 时失败。

其实此条语句在执行时,
select * from twgoldsell where ID in (@twgoldsellID)
执行的语句是:select * from twgoldsell where ID in ('813,1160,1219,1227,1232')
这样执行当然出错,因为@twgoldsellID是一个字符串,现在是以参数的形式传递。

解决办法:
select * from twgoldsell where ID in (@twgoldsellID)
改为:
exec('select * from twgoldsell where ID in ('+@twgoldsellID+')')

记住:一定要加exec执行函数,不然会报如下错误:
消息 245,级别 16,状态 1,过程 Web_gettwtwgoldgameserverGoldSell,第 8 行
在将 varchar 值 '+@twgoldsellID+' 转换成数据类型 int 时失败。

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